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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended		20 Months Ended
	Apr. 26, 2019	Mar. 12, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ 22,815	$ 120,863
Goodwill, Ending Balance				$ 815,624		$ 815,624	$ 805,284
Pika [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 49,068
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill	58,196
Goodwill, Ending Balance	$ 19,896
Neurio [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 59,071	$ 7,922
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill		58,762
Goodwill, Ending Balance		$ 17,862
Captiva, Energy Systems, and Mean Green Acquisitions [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total						$ 24,070

X

- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset including goodwill.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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- Details

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X

- Details

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